Full reference: P. D. Gingerich, M. Arif, M. A. Bhatti, M. Anwar, and W. J. Sanders. 1997. Basilosaurus drazindai and Basiloterus hussaini, new archaeoceti (Mammalia, Cetacea) from the Middle Eocene Drazinda Formation, with a revised interpretation of ages of whale-bearing strata in the Kirthar Group of the Sulaiman Range, Punjab (Pakistan). Contributions from the Museum of Paleontology, University of Michigan30(2):55-81